Left panel: Comparison of the posterior contours when fixing (i.e. maximising) the log₁₀|f_R0| parameter from the Fisher matrices for the full combination GC_sp+WL+GC_ph+XC_ph for the HS7 case. In dark yellow the HS7 case and in cyan dashed lines the GR baseline case. The contour shapes match very well in all parameter subspaces, considering that in σ₈ their fiducial values are different. This is expected from the fact that the HS7 model is very close to ΛCDM. Right panel: Full combination GC_sp+WL+GC_ph+XC_ph for the HS6 case, comparing the optimistic (yellow, solid) and pessimistic (cyan, empty) specifications. See Table 1 for details on these settings.